Submarine cable insulating medium recovery cover, modular recovery device and recovery method

Abstract

The invention provides a submarine cable insulation medium recovery cover, a modular recovery device and a recovery method, the submarine cable insulation medium recovery cover comprises an oil collection layering module, and the oil collection layering module comprises an outer cover, an inner cover and a layering bin; a plurality of first supporting legs are arranged at the bottom of the outer cover; the inner cover is fixedly arranged in the outer cover, and an oil inlet is formed in the inner cover; the layering bin is fixedly arranged in the outer cover, an oil-water diaphragm is arranged in the layering bin and divides the layering bin into an upper-layer bin and a lower-layer bin, the oil-water diaphragm only allows seawater to pass through, a backflow pipe is arranged on the lower-layer bin and is communicated with external seawater, an oil outlet and an injection port are formed in the upper-layer bin, and the oil outlet is arranged close to the top of the upper-layer bin; the injection port is used for injecting a catalyst and seawater into the upper-layer bin, and the upper-layer bin is communicated with the inner cover through a connecting pipe. According to the invention, an independent recovery cover for collecting oil is adopted, so that an insulating medium can be quickly layered with seawater in the recovery cover, and the recovery efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cable insulation medium recovery, and in particular to a submarine cable insulation medium recovery cover, a modular recovery device and a recovery method. Background Art

[0002] With the growing demand for global marine communications and power transmission, submarine cables, as an important means of communication and energy transmission connecting continents, are particularly important for their safety and stability. As an important type of submarine cable, oil-filled submarine cables occupy an important position in the field of submarine cables with their excellent insulation and heat dissipation properties.

[0003] As submarine cables and pipelines are located in complex seabed geological conditions, the seabed conditions change under the reciprocating scouring of waves and ocean currents, resulting in the exposure and suspension of submarine cables. The suspended part of the pipeline swings back and forth under the action of waves and ocean currents, causing fatigue stress condensation and then causing part of the pipeline to break and damage. This may not only cause the cable transmission function to fail, but the leakage of the insulating medium in the oil-filled submarine cable may also damage the marine and coastal environment, causing huge economic losses and ecological damage that is difficult to completely repair. The maintenance of underwater fault points is difficult and the maintenance cycle is long, so temporary recovery equipment is required to recover the leaked insulating medium to reduce the negative impact of the accident.

[0004] Existing submarine cable leakage insulating medium recovery devices mostly adopt a large recovery cover design. The oil collecting cover has both oil collecting and oil storage functions and is built separately according to the specific conditions of a certain project. For example, the Chinese invention patent application with application publication number CN117727513A, because the submarine cable will continuously discharge the insulating medium outward under positive pressure after being damaged, the insulating medium flow rate is fast, and the stratification efficiency with seawater is slow, so that the proportion of seawater in the recovered liquid is high and the recovery efficiency is low. Summary of the invention

[0005] The purpose of the present invention is to address the defects of the prior art and provide a submarine cable insulating medium recovery cover, a modular recovery device and a recovery method. A separate recovery cover for collecting oil is used so that the insulating medium can be quickly separated from the seawater in the recovery cover, thereby improving the recovery efficiency.

[0006] In order to solve the above technical problems, in a first aspect, the present invention provides a submarine cable insulating medium recovery cover, including an oil collecting and stratifying module, wherein the oil collecting and stratifying module includes an outer cover, an inner cover, and a stratifying bin;

[0007] A plurality of first legs are arranged at the bottom of the outer cover, and the outer cover is fixed on the seabed by the plurality of first legs;

[0008] The inner cover is fixedly arranged in the outer cover, and an oil inlet is provided in the inner cover, and the insulating medium leaked from the cable enters the inner cover through the oil inlet;

[0009] The stratified bin is fixedly arranged in the outer cover, and an oil-water diaphragm is arranged in the stratified bin, and the oil-water diaphragm separates the stratified bin into an upper bin and a lower bin, and the oil-water diaphragm only allows seawater to pass through. A reflux pipe is arranged on the lower bin, and the reflux pipe is connected with the external seawater. An oil outlet and an injection port are arranged on the upper bin, and the oil outlet is arranged near the top of the upper bin. The injection port is used to inject a catalyst and seawater into the upper bin, and the catalyst is used to promote stratification of the insulating medium and the seawater. The upper bin is connected with the inner cover through a connecting pipe.

[0010] Furthermore, the lower storehouse is arranged above the inner cover.

[0011] Furthermore, the first support leg includes a first telescopic rod and a first base plate, a first connecting seat is fixedly arranged on the first base plate, one end of the first telescopic rod is connected to the outer cover, the other end of the first telescopic rod is hinged to the first connecting seat, and a ballast is arranged on the upper surface of the first base plate.

[0012] Furthermore, one end of the first telescopic rod is detachably connected to the outer cover, a first support foot bolt is disposed on a side surface of the outer cover, and the first support foot is detachably connected to the first support foot bolt.

[0013] Furthermore, the outer cover is in a frustum shape.

[0014] In a second aspect, the present invention provides a modular recovery device for submarine cable insulating medium, comprising an oil storage module, a sealing collection clamp, and a flexible pipe. At least one oil storage module is provided, and the oil storage module is provided with a recovery port. The oil storage module is connected to a recovery ship through the recovery port. The sealing collection clamp and the oil inlet, and the oil outlet and the oil storage module are connected through a flexible pipe. The sealing collection clamp is used to clamp at the leakage point of the submarine cable, so that the insulating medium leaked from the submarine cable can enter the inner cover, the stratified bin, and the oil storage module in sequence through the flexible pipe.

[0015] Furthermore, the oil storage module includes an oil storage tank, which is provided with an input port and a recovery port. A retractable diaphragm is provided inside the oil storage tank, and the retractable diaphragm is used to balance the pressure difference between the inside and outside of the oil storage tank. One end of the oil storage tank is open and provided with a partition net, and the partition net is used to isolate external impurities.

[0016] Furthermore, the oil storage module includes an outer shell, the oil storage tank is fixed in the outer shell, a second support leg is arranged on the outer shell, the second support leg includes a second telescopic rod and a second base plate, a second connecting seat is fixedly arranged on the second base plate, one end of the second telescopic rod is connected to the outer shell, the other end of the second telescopic rod is hinged to the second connecting seat, and a ballast is arranged on the upper surface of the second base plate.

[0017] Furthermore, the sealing collection fixture comprises a sealing cylinder, which comprises two detachably connected semi-cylinders, the two semi-cylinders are sealedly connected, the semi-cylinders are sealedly connected to the submarine cable, and a flexible tube is connected to one of the semi-cylinders.

[0018] In a third aspect, the present invention provides a method for recovering an insulating medium of a submarine cable, comprising:

[0019] S1. Determine the number of oil storage modules according to the oil leakage rate and operation and maintenance requirements, adjust the first support leg and the second support leg according to the seabed conditions at the installation point, hoist the oil collecting and stratifying module and the oil storage module and place them at the pre-installation location, adjust the first support leg and the second support leg again for leveling, and place ballast on the first support leg and the second support leg for ballasting and fixing;

[0020] S2. Clamp the sealing collection fixture at the leakage point of the submarine cable, and connect the sealing collection fixture, the submarine cable insulation medium recovery cover, and the oil storage module through a flexible pipe;

[0021] S3. The recovery ship injects catalyst and seawater into the stratified compartment of the submarine cable insulation medium recovery cover through the injection port. At the same time, the ship-borne oil pump is connected to the recovery port of the last oil storage module through the recovery pipeline to collect the insulation medium.

[0022] The beneficial effects of the present invention are:

[0023] 1. The submarine cable insulating medium recovery cover of the present invention is only used for oil collection; by setting the outer cover, the inner cover and the stratification chamber can be protected to prevent the anchor from hitting and colliding with marine organisms; by setting the inner cover, the flow rate of the insulating medium can be reduced, and the stratification efficiency of the insulating medium in the stratification chamber can be improved; by setting the stratification chamber, and setting the oil-water diaphragm and the injection port in the stratification chamber, the oil-water diaphragm can balance the internal and external water pressures of the stratification chamber and prevent the insulating medium from flowing out of the stratification chamber, and the injection port can inject a catalyst to accelerate the stratification of the insulating medium and seawater. Therefore, the use of the oil-water diaphragm and the catalyst can reduce the water-oil mixture content in the recovered liquid in a physical and chemical combined manner, thereby improving the recovery efficiency.

[0024] 2. The present invention can further reduce the flow rate of the insulating medium entering the upper bin from the inner cover by arranging the lower bin above the inner cover.

[0025] 3. The outer cover of the present invention is configured in a truncated cone shape, which can reduce the impact of ocean currents and waves on the outer cover.

[0026] 4. Compared with the recovery hood in the prior art, which is difficult to be reused in other projects and has poor flexibility, scalability and recyclability, the present invention adopts a modular design. By setting a submarine cable insulating medium recovery hood, an oil storage module and a sealing collection clamp, the submarine cable insulating medium recovery hood is used for collecting oil, and the oil storage module is used for storing oil. The required number of oil storage modules can be determined according to the leakage rate, and the sealing collection clamp is used to clamp on the submarine cable to guide the insulating medium into the recovery hood. On the one hand, it can reduce the difficulty and cost of equipment construction and adapt to the needs of different projects for oil storage space. On the other hand, the volume of a single oil storage tank is also reduced, which is more adaptable to complex submarine environments and reduces the difficulty of installation.

[0027] 5. The oil storage module of the present invention can balance the pressure difference between the inside and outside of the oil storage tank by providing a retractable diaphragm, and can isolate external impurities and prevent marine organisms from parasitizing inside the oil storage tank by providing a partition net.

[0028] 6. The present invention can protect the oil storage tank by providing an outer shell, thereby reducing the impact of waves and external collisions.

[0029] 7. The present invention provides a retractable and angle-adjustable first support leg and a second support leg, so that the submarine cable insulation medium recovery cover and the oil storage module can be fixed according to the submarine environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of the submarine cable insulation medium recovery cover of the present invention;

[0031] Figure 2 It is a structural schematic diagram of a modular recovery device for submarine cable insulation medium of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the oil storage module of the present invention;

[0033] Figure 4 It is a layout diagram of the submarine cable insulation medium recovery cover on the inclined plane of the present invention;

[0034] Figure 5 This is a layout diagram of the oil storage module of the present invention on an inclined plane.

[0035] Reference numerals: oil collecting and stratifying module 1; outer cover 11; inner cover 12; oil inlet 121; stratification chamber 13; oil-water diaphragm 131; oil outlet 132; injection port 133; return pipe 134; first support leg 14; first support leg bolt 15; ballast 16; connecting pipe 17; mounting hardware 18; first valve 191; second valve 192;

[0036] Oil storage module 2; oil storage tank 21; housing 22; input port 23; recovery port 24; retractable diaphragm 25; partition net 26; second support leg 27; fixed support leg 28;

[0037] Sealing collection fixture 3;

[0038] Flexible tube 4;

[0039] Submarine cable 5; leakage point 51. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] Example 1

[0042] like Figure 1 As shown, this embodiment provides a submarine cable insulating medium recovery cover, including an oil collecting and stratifying module 1, the oil collecting and stratifying module 1 includes an outer cover 11, an inner cover 12, and a stratifying chamber 13;

[0043] The outer cover 11 is in a truncated cone shape, and an opening is provided at the bottom thereof. A plurality of first legs 14 are provided at the bottom edge of the outer cover 11. The first legs 14 include a first telescopic rod and a first bottom plate. A first connecting seat is welded to the first bottom plate. One end of the first telescopic rod is threadedly connected to the outer cover 11, and the other end of the first telescopic rod is hinged to the first connecting seat. The first bottom plate is placed on the seabed, and a ballast 16 is provided on the upper surface of the first bottom plate, so as to fix the outer cover 11 on the seabed. The first telescopic rod includes a fixed rod and a movable rod arranged in parallel. A plurality of positioning holes are provided on the fixed rod along the length direction, and the movable rod is fixed to different positioning holes by bolts to achieve telescoping.

[0044] A first support bolt 15 is reserved on the side of the outer cover 11, and the first support 14 can be fixed to the side of the outer cover 11 by the first support bolt 15, so as to adapt to different terrains, such as Figure 4 shown.

[0045] A hanging fitting 18 is provided at the top of the outer cover 11 .

[0046] The inner cover 12 is fixedly arranged in the outer cover 11. The inner cover 12 is a sealing structure. The inner cover 12 can be fixed to the outer cover 11 by welding or bolts. An oil inlet 121 is provided on the side of the inner cover 12. The insulating medium leaked from the submarine cable 5 can enter the inner cover 12 through the oil inlet 121. A first valve 191 is provided on the oil inlet 121.

[0047] The stratified bin 13 is fixedly arranged at the top of the outer cover 11 by a hanging hardware 18. An oil-water diaphragm 131 is arranged in the stratified bin 13. The oil-water diaphragm 131 separates the stratified bin 13 into an upper bin and a lower bin. The oil-water diaphragm 131 only allows seawater to pass through. A return pipe 134 is arranged at the bottom of the lower bin. The return pipe 134 is connected to the external seawater. The lower bin is arranged above the inner cover 12. An oil outlet 132 and an injection port 133 are arranged on the upper bin. The oil outlet 132 is arranged close to the top of the upper bin. The injection port 133 is used to inject catalyst and seawater into the upper bin. The catalyst is used to promote the stratification of the insulating medium and the seawater. The upper bin is connected to the top of the inner cover 12 through a connecting pipe 17. A second valve 192 is arranged on the injection port 133. The first valve 191 and the second valve 192 are both in a normally closed state when the insulating medium is not recovered, so as to isolate the inner cover 12 and the stratified bin 13 from the outside.

[0048] In this embodiment, the oil-water membrane 131 is a membrane composed of a hydrophilic and oleophobic high molecular polymer material, such as a PTS / PSF (titanium dioxide phosphate / polysulfone) composite membrane. This type of membrane can achieve the purpose of separating oil and water by controlling the difference in material porosity and oil-water affinity (contact angle).

[0049] Example 2

[0050] like Figure 2 As shown, this embodiment provides a modular recovery device for submarine cable insulating medium, including an oil collecting and stratifying module 1, an oil storage module 2, a sealing and collecting fixture 3, and a flexible tube 4. The sealing and collecting fixture 3 and the oil inlet 121 of the oil collecting and stratifying module 1, and the oil outlet 132 of the oil collecting and stratifying module 1 and the oil storage module 2 are connected through the flexible tube 4. The sealing and collecting fixture 3 is used to clamp at the leakage point 51 of the submarine cable 5, so that the insulating medium leaked from the submarine cable 5 can enter the inner cover 12, the stratification bin 13, and the oil storage module 2 in sequence through the flexible tube 4.

[0051] In this embodiment, four oil storage modules 2 are provided, such as Figure 3 As shown, the oil storage module 2 includes a shell 22 and an oil storage tank 21. The oil storage tank 21 is fixedly arranged in the shell 22. A plurality of second legs 27 and fixed legs 28 are arranged at the bottom of the shell 22. The structure of the second legs 27 is the same as that of the first legs 14. The shell 22 is fixed to the seabed by the second legs 27, the fixed legs 28 and the ballast 16, and the second legs 27 can be adjusted to adapt to different environments, such as Figure 5 shown.

[0052] like Figure 3As shown, the oil storage tank 21 is provided with an input port 23 and a recovery port 24, the oil storage module 2 is connected to the recovery ship through the recovery port 24, a retractable diaphragm 25 is provided in the oil storage tank 21, and the retractable diaphragm 25 is used to balance the pressure difference between the inside and outside of the oil storage tank 21, and one end of the oil storage tank 21 is open and provided with a partition net 26, and the partition net 26 is used to isolate external impurities. In this embodiment, the retractable diaphragm 25 should have good elasticity and water and oil isolation performance, and can be made of materials such as silicone and polyethylene. Figure 3 In the figure, three possible configurations of the retractable membrane 25 are shown by dashed lines.

[0053] The sealing collection fixture 3 includes a sealing cylinder, which includes two detachably connected semi-cylinders, which are connected by bolts, a sealing strip is arranged between the two semi-cylinders, and a sealing strip is also arranged between the semi-cylinders and the submarine cable 5, so that after the sealing collection fixture 3 is clamped on the submarine cable 5, the leakage point 51 can be isolated from the outside world, and a flexible tube 4 is connected to one of the semi-cylinders and connected to the oil inlet 121 of the oil collecting stratification module 1 through the flexible tube 4.

[0054] It can be understood that the leaked insulating medium flows to the inner cover 12 through the flexible pipe 4 to reduce the loss, and then flows into the upper compartment of the stratified compartment 13 through the connecting pipe 17. The insulating medium with a lighter density will be collected in the upper part of the upper compartment and lead to the oil storage module 2 through the oil outlet 132. The oil-water diaphragm 131 in the stratified compartment 13 can be moved to balance the internal and external pressures and discharge the seawater precipitated in the lower layer back to the sea through the return pipe 134, increasing the insulating medium content in the recovered liquid and improving the recovery efficiency. At the same time, the catalyst (such as nitrogen, methanol, etc.) can be injected into the upper compartment through the injection port 133 to complete the catalyst supplement, promote the stratification of the insulating medium and seawater, and further improve the recovery efficiency.

[0055] During the operation and maintenance phase of recovering the insulating medium, the recovery vessel connects the oil suction pipe to the recovery port 24 of the last oil storage tank 21 to suck out the insulating medium in the oil storage tank 21, thus completing the recovery of the insulating medium.

[0056] Example 3

[0057] Based on Example 2, this embodiment provides a method for recovering an insulating medium of a submarine cable, comprising:

[0058] S1. Determine the overall layout of the insulating medium recovery device according to the seabed conditions near the leakage point 51 of the oil-filled submarine cable 5, determine the size of the oil collecting and stratifying module 1 according to the seabed and anti-scour arrangement conditions near the oil leakage point, and determine the volume and number of the oil storage module 2 according to the leakage rate of the oil-filled submarine cable 5, the seabed conditions near the leakage point 51 and the operation and maintenance requirements; prefabricate the oil collecting and stratifying module 1 and the oil storage module 2 in the factory;

[0059] The first support leg 14 and the second support leg 27 are adjusted according to the seabed conditions at the installation point, the oil collecting and stratifying module 1 and the oil storage module 2 are hoisted and placed at the pre-installation location, the first support leg 14 and the second support leg 27 are adjusted again for leveling, and the ballast 16 is placed on the first support leg 14 and the second support leg 27 for ballasting and fixing;

[0060] S2, clamp the sealing collection fixture 3 at the leakage point 51 of the submarine cable 5, and connect the sealing collection fixture 3, the submarine cable insulation medium recovery cover, and the oil storage module 2 through the flexible pipe 4;

[0061] S3, open the second valve 192, and the recovery ship injects catalyst and seawater into the stratification chamber 13 of the submarine cable insulation medium recovery cover through the injection port 133. The injection of catalyst can promote the stratification of the insulation medium and seawater, and the injection of seawater can increase the pressure in the internal recovery channel and balance the pressure of the internal recovery channel and the external seawater. At the same time, connect the ship-borne oil pump to the recovery port 24 of the last oil storage module 2 through the recovery pipeline to collect the insulation medium. Before the ship-borne oil pump is turned on, close the first valve 191 to prevent the injected seawater and catalyst from flowing back into the submarine cable pipeline.

[0062] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A submarine cable insulation medium recovery cover, characterized in that: It comprises an oil collecting and stratifying module (1), wherein the oil collecting and stratifying module (1) comprises an outer cover (11), an inner cover (12), and a stratifying bin (13); A plurality of first supporting legs (14) are arranged at the bottom of the outer cover (11), and the outer cover (11) is fixed on the seabed by the plurality of first supporting legs (14); The inner cover (12) is fixedly arranged in the outer cover (11); the inner cover (12) is provided with an oil inlet (121); and the insulating medium leaked from the cable enters the inner cover (12) through the oil inlet (121); The stratified chamber (13) is fixedly arranged in the outer cover (11). An oil-water diaphragm (131) is arranged in the stratified chamber (13). The oil-water diaphragm (131) separates the stratified chamber (13) into an upper chamber and a lower chamber. The oil-water diaphragm (131) only allows seawater to pass through. A return pipe (134) is arranged on the lower chamber. The return pipe (134) is connected to the external seawater. An oil outlet (132) and an injection port (133) are arranged on the upper chamber. The oil outlet (132) is arranged close to the top of the upper chamber. The injection port (133) is used to inject a catalyst and seawater into the upper chamber. The catalyst is used to promote the stratification of the insulating medium and the seawater. The upper chamber is connected to the inner cover (12) via a connecting pipe (17).

2. The submarine cable insulation medium recovery cover according to claim 1 is characterized in that: The lower bin is arranged above the inner cover (12).

3. The submarine cable insulation medium recovery cover according to claim 1 is characterized in that: The first support leg (14) comprises a first telescopic rod and a first base plate, a first connecting seat is fixedly arranged on the first base plate, one end of the first telescopic rod is connected to the outer cover (11), the other end of the first telescopic rod is hinged to the first connecting seat, and a ballast (16) is arranged on the upper surface of the first base plate.

4. The submarine cable insulation medium recovery cover according to claim 3 is characterized in that: One end of the first telescopic rod is detachably connected to the outer cover (11); a first support foot bolt (15) is provided on the side of the outer cover (11); and the first support foot (14) is detachably connected to the first support foot bolt (15).

5. The submarine cable insulation medium recovery cover according to claim 1 is characterized in that: The outer cover (11) is in the shape of a truncated cone.

6. A modular submarine cable insulation medium recovery device of a submarine cable insulation medium recovery cover according to any one of claims 1 to 4, characterized in that: The invention comprises an oil storage module (2), a sealing collection clamp (3), and a flexible pipe (4). At least one oil storage module (2) is provided. The oil storage module (2) is provided with a recovery port (24). The oil storage module (2) is connected to a recovery ship via the recovery port (24). The sealing collection clamp (3) and the oil inlet (121) are connected, as are the oil outlet (132) and the oil storage module (2) via the flexible pipe (4). The sealing collection clamp (3) is used to clamp at a leakage point (51) of a submarine cable (5), so that the insulating medium leaked from the submarine cable (5) can enter the inner cover (12), the stratified compartment (13), and the oil storage module (2) in sequence via the flexible pipe (4).

7. The modular recovery device for submarine cable insulation medium according to claim 6 is characterized in that: The oil storage module (2) comprises an oil storage tank (21), an input port (23) and a recovery port (24) are arranged on the oil storage tank (21), a retractable diaphragm (25) is arranged inside the oil storage tank (21), and the retractable diaphragm (25) is used to balance the pressure difference between the inside and outside of the oil storage tank (21), and one end of the oil storage tank (21) is open and provided with a partition net (26), and the partition net (26) is used to isolate external impurities.

8. The modular recovery device for submarine cable insulation medium according to claim 7 is characterized in that: The oil storage module (2) comprises an outer shell (22), the oil storage tank (21) is fixed in the outer shell (22), a second support leg (27) is arranged on the outer shell (22), the second support leg (27) comprises a second telescopic rod and a second bottom plate, a second connecting seat is fixedly arranged on the second bottom plate, one end of the second telescopic rod is connected to the outer shell (22), the other end of the second telescopic rod is hinged to the second connecting seat, and a ballast (16) is arranged on the upper surface of the second bottom plate.

9. The modular recovery device for submarine cable insulation medium according to claim 7, characterized in that: The sealing collection fixture (3) comprises a sealing cylinder, which comprises two detachably connected semi-cylinders, the two semi-cylinders are sealedly connected to each other, the semi-cylinders are sealedly connected to the submarine cable (5), and a flexible tube (4) is connected to one of the semi-cylinders.

10. A method for recovering submarine cable insulation medium according to any one of claims 6 to 9, characterized in that: include: S1. Determine the number of oil storage modules (2) according to the oil leakage rate and operation and maintenance requirements, adjust the first support leg (14) and the second support leg (27) according to the seabed conditions at the installation point, hoist the oil collection and stratification module (1) and the oil storage module (2) to place them at the pre-installation location, adjust the first support leg (14) and the second support leg (27) again for leveling, and place the ballast (16) on the first support leg (14) and the second support leg (27) for ballasting and fixing; S2, clamping the sealing collection fixture (3) at the leakage point (51) of the submarine cable (5), and connecting the sealing collection fixture (3), the submarine cable insulation medium recovery cover, and the oil storage module (2) through a flexible pipe (4); S3, the recovery ship injects catalyst and seawater into the layered compartment (13) of the submarine cable insulation medium recovery cover through the injection port (133), and at the same time, connects the ship-borne oil pump to the recovery port (24) of the last oil storage module (2) through the recovery pipeline to collect the insulation medium.

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